All of the following are associated with the diagnosis of posttraumatic stress disorder EXCEPT:

A. Intrusion symptoms (e.g., memories, dreams).
B. Symptoms for < 1 month.
C. Negative changes in thoughts or mood (e.g., negative beliefs about oneself; feeling detached).
D. Alterations in arousal (e.g., angry outbursts, hypervigilance).

Ans: B. Symptoms for < 1 month.